pistol rear sight dovetail widths? any one know them?

by cable, Tuesday, June 11, 2013, 23:07 (4127 days ago)

i have an odd pistol, a french 22 lr semiauto called the Unique brand.. these are superbly accurate, but some idiot [ not me ] lost most of the works of the rear sight. it is an odd width dovetail, bigger than 3/8", probably metric. i could probably shim a 3/8" adjustable rear to work, but cant find data on what pistols have which dovetail width, so cant figure out what to order

any help appreciated.